Add a new Secondary Display Layout option on android that makes the secondary display honor swap button

src/android/app/src/main/java/org/citra/citra_emu/display/ScreenLayout.kt

@@ -56,7 +56,9 @@ enum class SecondaryDisplayLayout(val int: Int) {
     NONE(0),
     TOP_SCREEN(1),
     BOTTOM_SCREEN(2),
-    SIDE_BY_SIDE(3);
+    SIDE_BY_SIDE(3),
+
+    REVERSE_PRIMARY(4);
 
     companion object {
         fun from(int: Int): SecondaryDisplayLayout {

src/android/app/src/main/res/values/arrays.xml

@@ -37,9 +37,11 @@
 
     <string-array name="secondaryLayouts">
         <item>@string/emulation_secondary_display_default</item>
+        <item>@string/emulation_secondary_display_reverse_primary</item>
         <item>@string/emulation_top_screen</item>
         <item>@string/emulation_bottom_screen</item>
         <item>@string/emulation_screen_layout_sidebyside</item>
+
     </string-array>
 
     <integer-array name="portraitLayoutValues">
@@ -50,6 +52,7 @@
 
     <integer-array name="secondaryLayoutValues">
         <item>0</item>
+        <item>4</item>
         <item>1</item>
         <item>2</item>
         <item>3</item>

src/android/app/src/main/res/values/strings.xml

@@ -510,6 +510,7 @@
     <string name="emulation_screen_layout_original">Original</string>
     <string name="emulation_portrait_layout_top_full">Default</string>
     <string name="emulation_secondary_display_default">System Default (mirror)</string>
+    <string name="emulation_secondary_display_reverse_primary">Opposite of Primary Display</string>
     <string name="emulation_screen_layout_custom">Custom Layout</string>
     <string name="bg_color">Background Color</string>
     <string name="bg_color_description">The color which appears behind the screens during emulation, represented as an RGB value.</string>

src/common/settings.h

@@ -57,7 +57,7 @@ enum class PortraitLayoutOption : u32 {
     PortraitOriginal
 };
 
-enum class SecondaryDisplayLayout : u32 { None, TopScreenOnly, BottomScreenOnly, SideBySide };
+enum class SecondaryDisplayLayout : u32 { None, TopScreenOnly, BottomScreenOnly, SideBySide, ReversePrimary };
 /** Defines where the small screen will appear relative to the large screen
  * when in Large Screen mode
  */

src/core/frontend/framebuffer_layout.cpp

@@ -305,7 +305,8 @@ FramebufferLayout AndroidSecondaryLayout(u32 width, u32 height) {
     const Settings::SecondaryDisplayLayout layout =
         Settings::values.secondary_display_layout.GetValue();
     switch (layout) {
-
+    case Settings::SecondaryDisplayLayout::ReversePrimary:
+        return SingleFrameLayout(width,height,! Settings::values.swap_screen,Settings::values.upright_screen.GetValue());
     case Settings::SecondaryDisplayLayout::BottomScreenOnly:
         return SingleFrameLayout(width, height, true, Settings::values.upright_screen.GetValue());
     case Settings::SecondaryDisplayLayout::SideBySide: